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push vs concat vs spread - 0
(version: 0)
Comparing performance of:
spread vs push vs concat
Created:
3 years ago
by:
Guest
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Tests:
spread
let arr = [1,2,3] let barr = [...arr]
push
let arr = [1,2,3] let barr = [] barr.push(...arr)
concat
let arr = [1,2,3] let barr = [].concat(arr)
Rendered benchmark preparation results:
Suite status:
<idle, ready to run>
Run tests (3)
Previous results
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Test case name
Result
spread
push
concat
Fastest:
N/A
Slowest:
N/A
Latest run results:
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Autogenerated LLM Summary
(model
llama3.2:3b
, generated one year ago):
**Overview** The provided JSON represents a JavaScript microbenchmark created on MeasureThat.net. The benchmark compares the performance of three different approaches to create a new array by spreading an existing array: using the spread operator (`...`), the `push()` method, and the `concat()` method. **Benchmark Definition** The benchmark definition specifies that: * Three test cases are being compared. * Each test case creates a new array from an existing array `[1, 2, 3]`. * The `Script Preparation Code` is empty, indicating that no additional JavaScript code needs to be executed before running the tests. * The `Html Preparation Code` is also empty, suggesting that no HTML or CSS preparation is required. **Test Cases** There are three test cases: 1. **"spread"`**: Creates a new array by spreading the existing array `[1, 2, 3]` using the spread operator (`let barr = [...arr]`). * Pros: concise and expressive syntax. * Cons: may incur additional overhead due to creating a temporary array. 2. **"push"`**: Creates a new array by pushing elements from the existing array `[1, 2, 3]` using the `push()` method (`let barr = []\r\nbarr.push(...arr)`). * Pros: can be more efficient than spread operator for large arrays. * Cons: may require additional memory allocation and copying. 3. **"concat"`**: Creates a new array by concatenating the existing array `[1, 2, 3]` using the `concat()` method (`let barr = []\r\nbarr.concat(arr)`). * Pros: can be more efficient than push() for large arrays. * Cons: may incur additional overhead due to creating a temporary array. **Library and Special JS Features** None of the test cases use any libraries or special JavaScript features beyond standard ECMAScript syntax. **Other Considerations** When choosing between these approaches, consider the following factors: * Performance-critical code: For large arrays, `concat()` and `push()` might be more efficient than the spread operator. * Code readability and conciseness: The spread operator (`...`) is often considered a more readable and concise way to create new arrays. * Memory allocation and copying: If memory efficiency is crucial, `push()` might be a better choice. **Alternatives** If you need to compare performance of other array creation methods or approaches, consider using MeasureThat.net's benchmarking tool. Other alternatives include: * JavaScript profiling tools like Chrome DevTools' Profiler or Firefox Developer Edition's Web Performance Analyzer. * Custom benchmarking scripts using libraries like Benchmark.js or Microbenchmark. * Online code review platforms like GitHub's Code Review or Stack Overflow's Bounty system. By considering these factors and alternatives, you can better understand the performance characteristics of different array creation methods in JavaScript.
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